Easy to install and use - Attach the oil bleed funnel and add a small amount of brake fluid that matches the type of brake lever or handlebar you use. Remove the oil fill screw from the brake lever or handlebar. Finally, use the essential piston press tool to reset the piston and maintain smooth braking performance. Precise brake pad replacement - Facilitates accurate replacement of brake pads for bicycles. The piston press tool ensures the piston retracts for easy pad installation and removal. Practical design for maintenance - This piston press tool is a practical solution for bicycle maintenance. Its fast and effortless piston retraction makes it suitable for passionate cyclists and repair technicians, significantly improving repair efficiency and saving time. Durable, wear-resistant construction - Made from wear-resistant materials with a sturdy, thick construction. This tool for bicycle brake calipers offers strong toughness, is not easily broken, and is safe to use. 2-3 practical use scenarios - Scenario 1: Replacing brake pads on hydraulic disc brakes on road or mountain bikes, using the piston retraction to create space for new pads. - Scenario 2: Retracting the piston after pad wear to restore proper clearance during brake service. - Scenario 3: Bleeding and refilling brake fluid, using the bleed funnel and removal of the fill screw as part of the maintenance process.